|  | #ifndef lint | 
|  | #ifndef NOID | 
|  | static char elsieid[] = "@(#)strftime.c 8.1"; | 
|  | /* | 
|  | ** Based on the UCB version with the ID appearing below. | 
|  | ** This is ANSIish only when "multibyte character == plain character". | 
|  | */ | 
|  | #endif /* !defined NOID */ | 
|  | #endif /* !defined lint */ | 
|  |  | 
|  | #include "private.h" | 
|  |  | 
|  | /* | 
|  | ** Copyright (c) 1989 The Regents of the University of California. | 
|  | ** All rights reserved. | 
|  | ** | 
|  | ** Redistribution and use in source and binary forms are permitted | 
|  | ** provided that the above copyright notice and this paragraph are | 
|  | ** duplicated in all such forms and that any documentation, | 
|  | ** advertising materials, and other materials related to such | 
|  | ** distribution and use acknowledge that the software was developed | 
|  | ** by the University of California, Berkeley. The name of the | 
|  | ** University may not be used to endorse or promote products derived | 
|  | ** from this software without specific prior written permission. | 
|  | ** THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | 
|  | ** IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | 
|  | ** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | 
|  | */ | 
|  |  | 
|  | #ifndef LIBC_SCCS | 
|  | #ifndef lint | 
|  | static const char   sccsid[] = "@(#)strftime.c  5.4 (Berkeley) 3/14/89"; | 
|  | #endif /* !defined lint */ | 
|  | #endif /* !defined LIBC_SCCS */ | 
|  |  | 
|  | #include "tzfile.h" | 
|  | #include "fcntl.h" | 
|  | #include "locale.h" | 
|  | #include <ctype.h> | 
|  | #if defined(__LP64__) | 
|  | #define time64_t time_t | 
|  | #define mktime64 mktime | 
|  | #else | 
|  | #include <time64.h> | 
|  | #endif | 
|  | #include "private/bionic_time.h"  /* for strftime_tz */ | 
|  |  | 
|  | /* struct lc_time_T is now defined as strftime_locale | 
|  | * in <time.h> | 
|  | */ | 
|  | #if 1 | 
|  | #define  lc_time_T    strftime_locale | 
|  | #else | 
|  | struct lc_time_T { | 
|  | const char *    mon[MONSPERYEAR]; | 
|  | const char *    month[MONSPERYEAR]; | 
|  | const char *    wday[DAYSPERWEEK]; | 
|  | const char *    weekday[DAYSPERWEEK]; | 
|  | const char *    X_fmt; | 
|  | const char *    x_fmt; | 
|  | const char *    c_fmt; | 
|  | const char *    am; | 
|  | const char *    pm; | 
|  | const char *    date_fmt; | 
|  | }; | 
|  | #endif | 
|  |  | 
|  | #define Locale  (&C_time_locale) | 
|  |  | 
|  | static const struct lc_time_T   C_time_locale = { | 
|  | { | 
|  | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | 
|  | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | 
|  | }, { | 
|  | "January", "February", "March", "April", "May", "June", | 
|  | "July", "August", "September", "October", "November", "December" | 
|  | }, { | 
|  | "January", "February", "March", "April", "May", "June", | 
|  | "July", "August", "September", "October", "November", "December" | 
|  | }, { | 
|  | "Sun", "Mon", "Tue", "Wed", | 
|  | "Thu", "Fri", "Sat" | 
|  | }, { | 
|  | "Sunday", "Monday", "Tuesday", "Wednesday", | 
|  | "Thursday", "Friday", "Saturday" | 
|  | }, | 
|  |  | 
|  | /* X_fmt */ | 
|  | "%H:%M:%S", | 
|  |  | 
|  | /* | 
|  | ** x_fmt | 
|  | ** C99 requires this format. | 
|  | ** Using just numbers (as here) makes Quakers happier; | 
|  | ** it's also compatible with SVR4. | 
|  | */ | 
|  | "%m/%d/%y", | 
|  |  | 
|  | /* | 
|  | ** c_fmt | 
|  | ** C99 requires this format. | 
|  | ** Previously this code used "%D %X", but we now conform to C99. | 
|  | ** Note that | 
|  | **  "%a %b %d %H:%M:%S %Y" | 
|  | ** is used by Solaris 2.3. | 
|  | */ | 
|  | "%a %b %e %T %Y", | 
|  |  | 
|  | /* am */ | 
|  | "AM", | 
|  |  | 
|  | /* pm */ | 
|  | "PM", | 
|  |  | 
|  | /* date_fmt */ | 
|  | "%a %b %e %H:%M:%S %Z %Y" | 
|  | }; | 
|  |  | 
|  | static char *   _add(const char *, char *, const char *, int); | 
|  | static char *   _conv(int, const char *, char *, const char *); | 
|  | static char *   _fmt(const char *, const struct tm *, char *, const char *, | 
|  | int *, const struct strftime_locale*); | 
|  | static char *   _yconv(int, int, int, int, char *, const char *, int); | 
|  | static char *   getformat(int, char *, char *, char *, char *); | 
|  |  | 
|  | extern char *   tzname[]; | 
|  |  | 
|  | #ifndef YEAR_2000_NAME | 
|  | #define YEAR_2000_NAME  "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS" | 
|  | #endif /* !defined YEAR_2000_NAME */ | 
|  |  | 
|  | #define IN_NONE 0 | 
|  | #define IN_SOME 1 | 
|  | #define IN_THIS 2 | 
|  | #define IN_ALL  3 | 
|  |  | 
|  | #define FORCE_LOWER_CASE 0x100 | 
|  |  | 
|  | size_t | 
|  | strftime(s, maxsize, format, t) | 
|  | char * const        s; | 
|  | const size_t        maxsize; | 
|  | const char * const  format; | 
|  | const struct tm * const t; | 
|  | { | 
|  | return strftime_tz(s, maxsize, format, t, Locale); | 
|  | } | 
|  |  | 
|  | size_t | 
|  | strftime_tz(s, maxsize, format, t, locale) | 
|  | char * const        s; | 
|  | const size_t        maxsize; | 
|  | const char * const  format; | 
|  | const struct tm * const t; | 
|  | const struct strftime_locale *locale; | 
|  | { | 
|  | char *  p; | 
|  | int warn; | 
|  |  | 
|  | tzset(); | 
|  | warn = IN_NONE; | 
|  | p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, locale); | 
|  | #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU | 
|  | if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { | 
|  | (void) fprintf(stderr, "\n"); | 
|  | if (format == NULL) | 
|  | (void) fprintf(stderr, "NULL strftime format "); | 
|  | else    (void) fprintf(stderr, "strftime format \"%s\" ", | 
|  | format); | 
|  | (void) fprintf(stderr, "yields only two digits of years in "); | 
|  | if (warn == IN_SOME) | 
|  | (void) fprintf(stderr, "some locales"); | 
|  | else if (warn == IN_THIS) | 
|  | (void) fprintf(stderr, "the current locale"); | 
|  | else    (void) fprintf(stderr, "all locales"); | 
|  | (void) fprintf(stderr, "\n"); | 
|  | } | 
|  | #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ | 
|  | if (p == s + maxsize) | 
|  | return 0; | 
|  | *p = '\0'; | 
|  | return p - s; | 
|  | } | 
|  |  | 
|  | static char *getformat(int modifier, char *normal, char *underscore, | 
|  | char *dash, char *zero) { | 
|  | switch (modifier) { | 
|  | case '_': | 
|  | return underscore; | 
|  |  | 
|  | case '-': | 
|  | return dash; | 
|  |  | 
|  | case '0': | 
|  | return zero; | 
|  | } | 
|  |  | 
|  | return normal; | 
|  | } | 
|  |  | 
|  | static char * | 
|  | _fmt(format, t, pt, ptlim, warnp, locale) | 
|  | const char *        format; | 
|  | const struct tm * const t; | 
|  | char *          pt; | 
|  | const char * const  ptlim; | 
|  | int *           warnp; | 
|  | const struct strftime_locale* locale; | 
|  | { | 
|  | for ( ; *format; ++format) { | 
|  | if (*format == '%') { | 
|  | int modifier = 0; | 
|  | label: | 
|  | switch (*++format) { | 
|  | case '\0': | 
|  | --format; | 
|  | break; | 
|  | case 'A': | 
|  | pt = _add((t->tm_wday < 0 || | 
|  | t->tm_wday >= DAYSPERWEEK) ? | 
|  | "?" : locale->weekday[t->tm_wday], | 
|  | pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'a': | 
|  | pt = _add((t->tm_wday < 0 || | 
|  | t->tm_wday >= DAYSPERWEEK) ? | 
|  | "?" : locale->wday[t->tm_wday], | 
|  | pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'B': | 
|  | if (modifier == '-') { | 
|  | pt = _add((t->tm_mon < 0 || | 
|  | t->tm_mon >= MONSPERYEAR) ? | 
|  | "?" : locale->standalone_month[t->tm_mon], | 
|  | pt, ptlim, modifier); | 
|  | } else { | 
|  | pt = _add((t->tm_mon < 0 || | 
|  | t->tm_mon >= MONSPERYEAR) ? | 
|  | "?" : locale->month[t->tm_mon], | 
|  | pt, ptlim, modifier); | 
|  | } | 
|  | continue; | 
|  | case 'b': | 
|  | case 'h': | 
|  | pt = _add((t->tm_mon < 0 || | 
|  | t->tm_mon >= MONSPERYEAR) ? | 
|  | "?" : locale->mon[t->tm_mon], | 
|  | pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'C': | 
|  | /* | 
|  | ** %C used to do a... | 
|  | **  _fmt("%a %b %e %X %Y", t); | 
|  | ** ...whereas now POSIX 1003.2 calls for | 
|  | ** something completely different. | 
|  | ** (ado, 1993-05-24) | 
|  | */ | 
|  | pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, | 
|  | pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'c': | 
|  | { | 
|  | int warn2 = IN_SOME; | 
|  |  | 
|  | pt = _fmt(locale->c_fmt, t, pt, ptlim, warnp, locale); | 
|  | if (warn2 == IN_ALL) | 
|  | warn2 = IN_THIS; | 
|  | if (warn2 > *warnp) | 
|  | *warnp = warn2; | 
|  | } | 
|  | continue; | 
|  | case 'D': | 
|  | pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, locale); | 
|  | continue; | 
|  | case 'd': | 
|  | pt = _conv(t->tm_mday, | 
|  | getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'E': | 
|  | case 'O': | 
|  | /* | 
|  | ** C99 locale modifiers. | 
|  | ** The sequences | 
|  | **  %Ec %EC %Ex %EX %Ey %EY | 
|  | **  %Od %oe %OH %OI %Om %OM | 
|  | **  %OS %Ou %OU %OV %Ow %OW %Oy | 
|  | ** are supposed to provide alternate | 
|  | ** representations. | 
|  | */ | 
|  | goto label; | 
|  | case '_': | 
|  | case '-': | 
|  | case '0': | 
|  | case '^': | 
|  | case '#': | 
|  | modifier = *format; | 
|  | goto label; | 
|  | case 'e': | 
|  | pt = _conv(t->tm_mday, | 
|  | getformat(modifier, "%2d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'F': | 
|  | pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, locale); | 
|  | continue; | 
|  | case 'H': | 
|  | pt = _conv(t->tm_hour, | 
|  | getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'I': | 
|  | pt = _conv((t->tm_hour % 12) ? | 
|  | (t->tm_hour % 12) : 12, | 
|  | getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'j': | 
|  | pt = _conv(t->tm_yday + 1, | 
|  | getformat(modifier, "%03d", "%3d", "%d", "%03d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'k': | 
|  | /* | 
|  | ** This used to be... | 
|  | **  _conv(t->tm_hour % 12 ? | 
|  | **      t->tm_hour % 12 : 12, 2, ' '); | 
|  | ** ...and has been changed to the below to | 
|  | ** match SunOS 4.1.1 and Arnold Robbins' | 
|  | ** strftime version 3.0. That is, "%k" and | 
|  | ** "%l" have been swapped. | 
|  | ** (ado, 1993-05-24) | 
|  | */ | 
|  | pt = _conv(t->tm_hour, | 
|  | getformat(modifier, "%2d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | #ifdef KITCHEN_SINK | 
|  | case 'K': | 
|  | /* | 
|  | ** After all this time, still unclaimed! | 
|  | */ | 
|  | pt = _add("kitchen sink", pt, ptlim, modifier); | 
|  | continue; | 
|  | #endif /* defined KITCHEN_SINK */ | 
|  | case 'l': | 
|  | /* | 
|  | ** This used to be... | 
|  | **  _conv(t->tm_hour, 2, ' '); | 
|  | ** ...and has been changed to the below to | 
|  | ** match SunOS 4.1.1 and Arnold Robbin's | 
|  | ** strftime version 3.0. That is, "%k" and | 
|  | ** "%l" have been swapped. | 
|  | ** (ado, 1993-05-24) | 
|  | */ | 
|  | pt = _conv((t->tm_hour % 12) ? | 
|  | (t->tm_hour % 12) : 12, | 
|  | getformat(modifier, "%2d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'M': | 
|  | pt = _conv(t->tm_min, | 
|  | getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'm': | 
|  | pt = _conv(t->tm_mon + 1, | 
|  | getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'n': | 
|  | pt = _add("\n", pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'p': | 
|  | pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? | 
|  | locale->pm : | 
|  | locale->am, | 
|  | pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'P': | 
|  | pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? | 
|  | locale->pm : | 
|  | locale->am, | 
|  | pt, ptlim, FORCE_LOWER_CASE); | 
|  | continue; | 
|  | case 'R': | 
|  | pt = _fmt("%H:%M", t, pt, ptlim, warnp, locale); | 
|  | continue; | 
|  | case 'r': | 
|  | pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp, locale); | 
|  | continue; | 
|  | case 'S': | 
|  | pt = _conv(t->tm_sec, | 
|  | getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 's': | 
|  | { | 
|  | struct tm   tm; | 
|  | char        buf[INT_STRLEN_MAXIMUM( | 
|  | time64_t) + 1]; | 
|  | time64_t    mkt; | 
|  |  | 
|  | tm = *t; | 
|  | mkt = mktime64(&tm); | 
|  | if (TYPE_SIGNED(time64_t)) | 
|  | (void) snprintf(buf, sizeof(buf), "%lld", | 
|  | (long long) mkt); | 
|  | else    (void) snprintf(buf, sizeof(buf), "%llu", | 
|  | (unsigned long long) mkt); | 
|  | pt = _add(buf, pt, ptlim, modifier); | 
|  | } | 
|  | continue; | 
|  | case 'T': | 
|  | pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, locale); | 
|  | continue; | 
|  | case 't': | 
|  | pt = _add("\t", pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'U': | 
|  | pt = _conv((t->tm_yday + DAYSPERWEEK - | 
|  | t->tm_wday) / DAYSPERWEEK, | 
|  | getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'u': | 
|  | /* | 
|  | ** From Arnold Robbins' strftime version 3.0: | 
|  | ** "ISO 8601: Weekday as a decimal number | 
|  | ** [1 (Monday) - 7]" | 
|  | ** (ado, 1993-05-24) | 
|  | */ | 
|  | pt = _conv((t->tm_wday == 0) ? | 
|  | DAYSPERWEEK : t->tm_wday, "%d", pt, ptlim); | 
|  | continue; | 
|  | case 'V':   /* ISO 8601 week number */ | 
|  | case 'G':   /* ISO 8601 year (four digits) */ | 
|  | case 'g':   /* ISO 8601 year (two digits) */ | 
|  | /* | 
|  | ** From Arnold Robbins' strftime version 3.0: "the week number of the | 
|  | ** year (the first Monday as the first day of week 1) as a decimal number | 
|  | ** (01-53)." | 
|  | ** (ado, 1993-05-24) | 
|  | ** | 
|  | ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: | 
|  | ** "Week 01 of a year is per definition the first week which has the | 
|  | ** Thursday in this year, which is equivalent to the week which contains | 
|  | ** the fourth day of January. In other words, the first week of a new year | 
|  | ** is the week which has the majority of its days in the new year. Week 01 | 
|  | ** might also contain days from the previous year and the week before week | 
|  | ** 01 of a year is the last week (52 or 53) of the previous year even if | 
|  | ** it contains days from the new year. A week starts with Monday (day 1) | 
|  | ** and ends with Sunday (day 7). For example, the first week of the year | 
|  | ** 1997 lasts from 1996-12-30 to 1997-01-05..." | 
|  | ** (ado, 1996-01-02) | 
|  | */ | 
|  | { | 
|  | int year; | 
|  | int base; | 
|  | int yday; | 
|  | int wday; | 
|  | int w; | 
|  |  | 
|  | year = t->tm_year; | 
|  | base = TM_YEAR_BASE; | 
|  | yday = t->tm_yday; | 
|  | wday = t->tm_wday; | 
|  | for ( ; ; ) { | 
|  | int len; | 
|  | int bot; | 
|  | int top; | 
|  |  | 
|  | len = isleap_sum(year, base) ? | 
|  | DAYSPERLYEAR : | 
|  | DAYSPERNYEAR; | 
|  | /* | 
|  | ** What yday (-3 ... 3) does | 
|  | ** the ISO year begin on? | 
|  | */ | 
|  | bot = ((yday + 11 - wday) % | 
|  | DAYSPERWEEK) - 3; | 
|  | /* | 
|  | ** What yday does the NEXT | 
|  | ** ISO year begin on? | 
|  | */ | 
|  | top = bot - | 
|  | (len % DAYSPERWEEK); | 
|  | if (top < -3) | 
|  | top += DAYSPERWEEK; | 
|  | top += len; | 
|  | if (yday >= top) { | 
|  | ++base; | 
|  | w = 1; | 
|  | break; | 
|  | } | 
|  | if (yday >= bot) { | 
|  | w = 1 + ((yday - bot) / | 
|  | DAYSPERWEEK); | 
|  | break; | 
|  | } | 
|  | --base; | 
|  | yday += isleap_sum(year, base) ? | 
|  | DAYSPERLYEAR : | 
|  | DAYSPERNYEAR; | 
|  | } | 
|  | #ifdef XPG4_1994_04_09 | 
|  | if ((w == 52 && | 
|  | t->tm_mon == TM_JANUARY) || | 
|  | (w == 1 && | 
|  | t->tm_mon == TM_DECEMBER)) | 
|  | w = 53; | 
|  | #endif /* defined XPG4_1994_04_09 */ | 
|  | if (*format == 'V') | 
|  | pt = _conv(w, | 
|  | getformat(modifier, | 
|  | "%02d", | 
|  | "%2d", | 
|  | "%d", | 
|  | "%02d"), | 
|  | pt, ptlim); | 
|  | else if (*format == 'g') { | 
|  | *warnp = IN_ALL; | 
|  | pt = _yconv(year, base, 0, 1, | 
|  | pt, ptlim, modifier); | 
|  | } else  pt = _yconv(year, base, 1, 1, | 
|  | pt, ptlim, modifier); | 
|  | } | 
|  | continue; | 
|  | case 'v': | 
|  | /* | 
|  | ** From Arnold Robbins' strftime version 3.0: | 
|  | ** "date as dd-bbb-YYYY" | 
|  | ** (ado, 1993-05-24) | 
|  | */ | 
|  | pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, locale); | 
|  | continue; | 
|  | case 'W': | 
|  | pt = _conv((t->tm_yday + DAYSPERWEEK - | 
|  | (t->tm_wday ? | 
|  | (t->tm_wday - 1) : | 
|  | (DAYSPERWEEK - 1))) / DAYSPERWEEK, | 
|  | getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | continue; | 
|  | case 'w': | 
|  | pt = _conv(t->tm_wday, "%d", pt, ptlim); | 
|  | continue; | 
|  | case 'X': | 
|  | pt = _fmt(locale->X_fmt, t, pt, ptlim, warnp, locale); | 
|  | continue; | 
|  | case 'x': | 
|  | { | 
|  | int warn2 = IN_SOME; | 
|  |  | 
|  | pt = _fmt(locale->x_fmt, t, pt, ptlim, &warn2, locale); | 
|  | if (warn2 == IN_ALL) | 
|  | warn2 = IN_THIS; | 
|  | if (warn2 > *warnp) | 
|  | *warnp = warn2; | 
|  | } | 
|  | continue; | 
|  | case 'y': | 
|  | *warnp = IN_ALL; | 
|  | pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, | 
|  | pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'Y': | 
|  | pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, | 
|  | pt, ptlim, modifier); | 
|  | continue; | 
|  | case 'Z': | 
|  | #ifdef TM_ZONE | 
|  | if (t->TM_ZONE != NULL) | 
|  | pt = _add(t->TM_ZONE, pt, ptlim, | 
|  | modifier); | 
|  | else | 
|  | #endif /* defined TM_ZONE */ | 
|  | if (t->tm_isdst >= 0) | 
|  | pt = _add(tzname[t->tm_isdst != 0], | 
|  | pt, ptlim, modifier); | 
|  | /* | 
|  | ** C99 says that %Z must be replaced by the | 
|  | ** empty string if the time zone is not | 
|  | ** determinable. | 
|  | */ | 
|  | continue; | 
|  | case 'z': | 
|  | { | 
|  | long     diff; | 
|  | char const *    sign; | 
|  |  | 
|  | if (t->tm_isdst < 0) | 
|  | continue; | 
|  | #ifdef TM_GMTOFF | 
|  | diff = t->TM_GMTOFF; | 
|  | #else /* !defined TM_GMTOFF */ | 
|  | /* | 
|  | ** C99 says that the UT offset must | 
|  | ** be computed by looking only at | 
|  | ** tm_isdst. This requirement is | 
|  | ** incorrect, since it means the code | 
|  | ** must rely on magic (in this case | 
|  | ** altzone and timezone), and the | 
|  | ** magic might not have the correct | 
|  | ** offset. Doing things correctly is | 
|  | ** tricky and requires disobeying C99; | 
|  | ** see GNU C strftime for details. | 
|  | ** For now, punt and conform to the | 
|  | ** standard, even though it's incorrect. | 
|  | ** | 
|  | ** C99 says that %z must be replaced by the | 
|  | ** empty string if the time zone is not | 
|  | ** determinable, so output nothing if the | 
|  | ** appropriate variables are not available. | 
|  | */ | 
|  | if (t->tm_isdst == 0) | 
|  | #ifdef USG_COMPAT | 
|  | diff = -timezone; | 
|  | #else /* !defined USG_COMPAT */ | 
|  | continue; | 
|  | #endif /* !defined USG_COMPAT */ | 
|  | else | 
|  | #ifdef ALTZONE | 
|  | diff = -altzone; | 
|  | #else /* !defined ALTZONE */ | 
|  | continue; | 
|  | #endif /* !defined ALTZONE */ | 
|  | #endif /* !defined TM_GMTOFF */ | 
|  | if (diff < 0) { | 
|  | sign = "-"; | 
|  | diff = -diff; | 
|  | } else  sign = "+"; | 
|  | pt = _add(sign, pt, ptlim, modifier); | 
|  | diff /= SECSPERMIN; | 
|  | diff = (diff / MINSPERHOUR) * 100 + | 
|  | (diff % MINSPERHOUR); | 
|  | pt = _conv(diff, | 
|  | getformat(modifier, "%04d", | 
|  | "%4d", "%d", "%04d"), | 
|  | pt, ptlim); | 
|  | } | 
|  | continue; | 
|  | case '+': | 
|  | pt = _fmt(locale->date_fmt, t, pt, ptlim, | 
|  | warnp, locale); | 
|  | continue; | 
|  | case '%': | 
|  | /* | 
|  | ** X311J/88-090 (4.12.3.5): if conversion char is | 
|  | ** undefined, behavior is undefined. Print out the | 
|  | ** character itself as printf(3) also does. | 
|  | */ | 
|  | default: | 
|  | break; | 
|  | } | 
|  | } | 
|  | if (pt == ptlim) | 
|  | break; | 
|  | *pt++ = *format; | 
|  | } | 
|  | return pt; | 
|  | } | 
|  |  | 
|  | static char * | 
|  | _conv(n, format, pt, ptlim) | 
|  | const int       n; | 
|  | const char * const  format; | 
|  | char * const        pt; | 
|  | const char * const  ptlim; | 
|  | { | 
|  | char    buf[INT_STRLEN_MAXIMUM(int) + 1]; | 
|  |  | 
|  | (void) snprintf(buf, sizeof(buf), format, n); | 
|  | return _add(buf, pt, ptlim, 0); | 
|  | } | 
|  |  | 
|  | static char * | 
|  | _add(str, pt, ptlim, modifier) | 
|  | const char *        str; | 
|  | char *          pt; | 
|  | const char * const  ptlim; | 
|  | int                     modifier; | 
|  | { | 
|  | int c; | 
|  |  | 
|  | switch (modifier) { | 
|  | case FORCE_LOWER_CASE: | 
|  | while (pt < ptlim && (*pt = tolower(*str++)) != '\0') { | 
|  | ++pt; | 
|  | } | 
|  | break; | 
|  |  | 
|  | case '^': | 
|  | while (pt < ptlim && (*pt = toupper(*str++)) != '\0') { | 
|  | ++pt; | 
|  | } | 
|  | break; | 
|  |  | 
|  | case '#': | 
|  | while (pt < ptlim && (c = *str++) != '\0') { | 
|  | if (isupper(c)) { | 
|  | c = tolower(c); | 
|  | } else if (islower(c)) { | 
|  | c = toupper(c); | 
|  | } | 
|  | *pt = c; | 
|  | ++pt; | 
|  | } | 
|  |  | 
|  | break; | 
|  |  | 
|  | default: | 
|  | while (pt < ptlim && (*pt = *str++) != '\0') { | 
|  | ++pt; | 
|  | } | 
|  | } | 
|  |  | 
|  | return pt; | 
|  | } | 
|  |  | 
|  | /* | 
|  | ** POSIX and the C Standard are unclear or inconsistent about | 
|  | ** what %C and %y do if the year is negative or exceeds 9999. | 
|  | ** Use the convention that %C concatenated with %y yields the | 
|  | ** same output as %Y, and that %Y contains at least 4 bytes, | 
|  | ** with more only if necessary. | 
|  | */ | 
|  |  | 
|  | static char * | 
|  | _yconv(a, b, convert_top, convert_yy, pt, ptlim, modifier) | 
|  | const int       a; | 
|  | const int       b; | 
|  | const int       convert_top; | 
|  | const int       convert_yy; | 
|  | char *          pt; | 
|  | const char * const  ptlim; | 
|  | int                     modifier; | 
|  | { | 
|  | register int    lead; | 
|  | register int    trail; | 
|  |  | 
|  | #define DIVISOR 100 | 
|  | trail = a % DIVISOR + b % DIVISOR; | 
|  | lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; | 
|  | trail %= DIVISOR; | 
|  | if (trail < 0 && lead > 0) { | 
|  | trail += DIVISOR; | 
|  | --lead; | 
|  | } else if (lead < 0 && trail > 0) { | 
|  | trail -= DIVISOR; | 
|  | ++lead; | 
|  | } | 
|  | if (convert_top) { | 
|  | if (lead == 0 && trail < 0) | 
|  | pt = _add("-0", pt, ptlim, modifier); | 
|  | else    pt = _conv(lead, getformat(modifier, "%02d", | 
|  | "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | } | 
|  | if (convert_yy) | 
|  | pt = _conv(((trail < 0) ? -trail : trail), | 
|  | getformat(modifier, "%02d", "%2d", "%d", "%02d"), | 
|  | pt, ptlim); | 
|  | return pt; | 
|  | } |